Most humans infected by the West Nile Virus have no symptoms, while a few may have these symptoms:

fever

headache

body aches,

lethargy

skin rash on the chest, back and arms

swollen lymph glands

Those seriously infected, particularly the elderly, display these symptoms:

headache

high fever

stupor

coma

tremors

muscle weakness

muscle weakness

stiff neck

disorientation

convulsions

paralysis

in rare cases death

The after-effects of West Nile virus include mild weakness and memory loss that usually clears up within a few weeks. Recover is nearly always complete but less rapid in adults and children. There is also a low incidence of seizures.

Less than one percent affected become seriously ill and that occurs within three to 15 days after the bite of the infected mosquito.